first act第一幕firstadj.第一的；最初的adv.首先；第一n.最初；(序数词)第一first open fire range首次发射距离first amplifier valve第一级放大管first master sergeant一等士官长first-class highway一级公路first-class project精品工程First War of Religion第一次宗教战争(1562-1563)first permanent molar第一恒磨牙first-level storage一级存储器First Battle of Paris第一次巴黎之战(1814)First things first.首要的事先办。

1. The first fine careless rapture!
   第一遍即兴唱出的美妙欢乐！
2. Sections that may be passed over in first reading are marked with an asterisk.
   凡在第一遍阅读时可以忽略的一些段落都用星号标明。
3. The boundary which had first passed was readopt by a large vote.
   第一次通过的边界线已过大多数投票通过再予采用。
4. Here is a bit of a road map to guide you through these pages the first time.
   这里是一些线路图，以引导你首次通过这些页面。
5. It is pointes out to remove the scratch by adopting double circular pass guide rolls and using proper width steel strip.
   指出通过用双圆弧导向辊的孔型和采用合适的钢带宽度，才能够彻底消除焊缝边缘划痕这一现象。